<?php
print_r($_GET['ing']);
?>
<form action="sandbox.php" method="get">
<input type="text" name="ing['name']" size="20" />
<input type="text" name="ing['age']" size="4" />
<input type="text" name="ing['zip']" size="6" />
<input type="submit" name="submit" value="submit" />
</form>